9987987 has 8 divisors (see below), whose sum is σ = 13331920. Its totient is φ = 6651360.

The previous prime is 9987979. The next prime is 9988001. The reversal of 9987987 is 7897899.

It is a happy number.

9987987 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9987987 - 2³ = 9987979 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9987937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4437 + ... + 6297.

It is an arithmetic number, because the mean of its divisors is an integer number (1666490).

Almost surely, 2^9987987 is an apocalyptic number.

9987987 is a deficient number, since it is larger than the sum of its proper divisors (3343933).

9987987 is a wasteful number, since it uses less digits than its factorization.

9987987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3653.

The product of its digits is 2286144, while the sum is 57.

The square root of 9987987 is about 3160.3776673050. The cubic root of 9987987 is about 215.3571636880.

The spelling of 9987987 in words is "nine million, nine hundred eighty-seven thousand, nine hundred eighty-seven".